In each of the stages half of the study population (15 adults, 33 neonates) will receive BCG via conventional syringe and needle (standard of care administration technique), and half (15 adults, 33 neonates) will receive BCG via jet injector (investigational administration technique). A single and standard volume and dose of BCG will be administered per the package insert. Neonates will receive their BCG shortly after birth.